OOPS ABAP : Abstract Class with Example

Abstract Class:

  • It is a special type of class which has at least one abstract method.
  • Abstract method is that method which has only definition. There will not be any implementation.
  • We can not create object of Abstract class.
  • We can create objects of sub classes of Abstract class.

Example:

  • Go to se24
  • Enter class name and click on create and select 'Abstract' Inst.Generation.
  • Uncheck the Final check box(If it is checked we can not create sub classes) .
  • Press enter.
 
  • Enter the method details and click on 'Goto properties' icon
.
  •  Check the 'Abstract' check box and clickon 'yes'.

 
  • Click on 'change' and activate the class.

  • If we try to write code in 'DISPLAY' method, it throws the message 'Method DISPLAY is abstract.
 Using this abstract method in Subclass:
  • Create subclass and it can be final.

  • Goto properties tab,click on superclass button and enter the class name zabstract_cls.
 
  •  Save and activate.
  • Click on 'redefine' icon.
 
  • Now click on source code button and write the below code.
  • save, check and activate.
if you don't want to implement this method you can simply undo the method by clicking on 'undo redefinition' icon next to redefine method.
 
 

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